While wearables have gotten pretty good at tracking a range of health-related activities, there’s still no simple, automated, unobtrusive way to track one of the vital things we all do every day: eat.

Researchers at Dartmouth College and Clemson University have built a prototype of a headband-like device that they think could be a step toward making this happen. Part of a project called Auracle, the gadget uses a microphone placed on the skin to capture sounds of mouth-related activities that are then analyzed to pinpoint when the wearer is eating—an activity that can be tricky to distinguish from things like talking or coughing.